CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital	Accumulated Deficit	Total
Beginning Balance at Dec. 31, 2017	$ 1	$ 47,223	$ (39,157)	$ 8,067
Beginning Balance (in shares) at Dec. 31, 2017	567
Issuance of common stock, net of fees		1,179		1,179
Issuance of common stock, net of fees (in shares)	98
Stock-based compensation		416		416
Net loss			(6,674)	(6,674)
Ending Balance at Sep. 30, 2018	$ 1	48,818	(45,831)	2,988
Ending Balance (in shares) at Sep. 30, 2018	665
Beginning Balance at Jun. 30, 2018	$ 1	47,486	(42,750)	4,737
Beginning Balance (in shares) at Jun. 30, 2018	567
Issuance of common stock, net of fees		1,179		1,179
Issuance of common stock, net of fees (in shares)	98
Stock-based compensation		153		153
Net loss			(3,081)	(3,081)
Ending Balance at Sep. 30, 2018	$ 1	48,818	(45,831)	2,988
Ending Balance (in shares) at Sep. 30, 2018	665
Beginning Balance at Dec. 31, 2018	$ 1	48,957	(47,740)	1,218
Beginning Balance (in shares) at Dec. 31, 2018	680
Issuance of common stock, net of fees	$ 2	19,409		19,411
Issuance of common stock, net of fees (in shares)	1,794
Exercise of warrants, net of fees	$ 0	1,083		1,083
Exercise of warrants, net of fees (in shares)	410
Stock-based compensation		522		522
Net loss			(6,210)	(6,210)
Ending Balance at Sep. 30, 2019	$ 3	69,971	(53,950)	16,024
Ending Balance (in shares) at Sep. 30, 2019	2,884
Beginning Balance at Jun. 30, 2019	$ 3	69,618	(51,708)	17,913
Beginning Balance (in shares) at Jun. 30, 2019	2,831
Exercise of warrants, net of fees	$ 0	169	0	169
Exercise of warrants, net of fees (in shares)	53
Stock-based compensation		184		184
Net loss			(2,242)	(2,242)
Ending Balance at Sep. 30, 2019	$ 3	$ 69,971	$ (53,950)	$ 16,024
Ending Balance (in shares) at Sep. 30, 2019	2,884